Effect of heat stress on the performance and some blood parameters in pair-fed broiler chickens
2012
Hussein A.S. | Daghir N.J. | Ayoub M.A. | Wasfi I.A. | Abdel Hadi A.H.A. | Hussein, A.S., Department of Aridland Agriculture, Faculty of Food and Agriculture, UAE University, 17555, Al-Ain, United Arab Emirates | Daghir, N.J., Faculty of Agricultural and Food Sciences, American University of Beirut, Lebanon | Ayoub, M.A., Department of Aridland Agriculture, Faculty of Food and Agriculture, UAE University, 17555, Al-Ain, United Arab Emirates | Wasfi, I.A., Forensic Science Laboratory, 253, Abu Dhabi, United Arab Emirates | Abdel Hadi, A.H.A., Forensic Science Laboratory, 253, Abu Dhabi, United Arab Emirates | Hussein, A. S.; Department of Aridland Agriculture, Faculty of Food and Agriculture, UAE University, 17555, Al-Ain, United Arab Emirates; email: [email protected] | University: American University of Beirut; Faculty: Faculty of Agricultural and Food Sciences; Department: FAFS; | FAFS | Faculty of Agricultural and Food Sciences | American University of Beirut
The effects of heat stress on the performance and blood parameters in pair-fed and force-fed broilers were investigated to partition the effects of high temperature and feed intake in chickens. The chicks were housed in two Petersime battery cages. In experiment 1, one battery was exposed to hot cycling temperature (HT) of 25-32°C and the other to a constant temperature (CT) of 22°C. In the second trial, one battery was exposed to HT of 26-34°C and the other to a CT of 23°C. In experiment 3, one battery was exposed to HT of 25-36°C and the other to a CT of 24°C. In all trials, the treatments consisted of feeding a diet ad libitum to a CT ad libitum group of chicks reared under CT condition. Chicks in treatment 2 (HT forcefeeding) were housed in the HT condition and force-fed the amount of intake of birds fed the CT ad libitum diet. Chicks in treatment 3 (HT ad libitum) were fed the diet ad libitum under HT condition and birds in treatment 4 (CT pair-feeding) were housed under CT, and pair-fed the diet at the level of intake of chicks fed the HT ad libitum diet. Results showed that HT birds, force-fed, gained 18, 20 and 33percent less weight in experiment 1, 2 and 3, respectively, while HT ad libitum birds gained 11, 26 and 27percent less weight in trials 1, 2 and 3, respectively. CT pair-feeding birds gained about 9percent less than HT ad libitum birds in all three trials. Based on trial 1 and 2 results, it is estimated that approximately 20percent of the reduction in broiler weight gain was due to high temperature per se.
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